In addition, the software required to set this up is no longer available and would only run on Windows XP machines – something most companies have phased out. This means once you replace a CPU, you will only have (23) days of redundancy! The GE 90-30 PLC is obsolete now, and it is NO LONGER POSSIBLE to get enabling codes from GE. If the enabling code is not installed, the system will run for (23) days, and then the redundancy will stop working. To make this software redundancy solution work, the user must contact GE after a CPU change has been made to receive an “Enabling Code” which then must be downloaded to the CPU. There can be multiple different I/O networks associated with these redundant PLCs. This solution consists of a pair of 90-30 PLCs that are connected to each other and use proprietary software blocks to perform data synchronization and redundancy. For years, GE has sold a redundant 90-30 PLC solution, called MAXON 9030 or HBR.
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